melissa123 answered Sunday July 3 2011, 9:03 pm: when you first get it it's a little off. but when you have had your period for awhile, your period will be constant, meaning it will fall on the same day mostly, right around there(:
if you haven;t gotten your period yet, you never know when your going to get it.
hope i helped! if you have any questions about anything feel free to ask!(:
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